Our Access XP application uses calendar control(MSCAL.OCX).
It works fine on most machines, however some sites reported "Overflow" error(6) when they tried to open a form with a calendar.
It's possibly related to problems, described in the articles http://support.microsoft.com/default.aspx?scid=kb%3ben-us%3b236529 or http://support.microsoft.com/default.aspx?scid=kb;en-us;Q311219
Our support team managed to workaround the problem by manually copy expected version of mscal.ocx instead of wrong one.